user tagging/ collaborative tagging
user tagging may be a way of “crowd sourcing” the cataloging of all of our resources. Sometimes, authors might not include all of the tags that users might find relevant, so allowing users to add tags to content might make it easier for them to find what they are looking for.
What would it take to add this ability? Pehraps the tags could be color coded so that we could differentiate between user supplied tags and author supplied tags.